pile-up noun
ADJ. multiple a multiple pile-up involving a minibus and five cars | eight-vehicle, five-car, etc. | motorway PILE-UP + VERB involve sth | happen, occur
PREP. in a/the ~ A young man died in a pile-up on the M1 last night.
You can also check other dicts: pile-up (English, 中文解释 ), wordnet sense, Collins Definition